LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) loan_segment loan	Dec. 31, 2023 USD ($) loan_segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 18,934	$ 18,934	$ 9,094
Loans	12,486,027	12,486,027	12,003,894
Year 2	2,546,512	2,546,512	2,680,834
Year 3	$ 2,063,941	$ 2,063,941	1,843,080
Number of portfolio loan segments | loan_segment	10	10
Increase in allowance for credit losses		$ 18,300
Net charge-offs		25,600
Loans charged off		28,039	6,601	$ 11,884
Provision for credit losses		7,300	0	0
CECL Day 1 non-PCD provision for credit losses			13,955
Accrual for off-balance sheet commitments	$ 19,500	19,500	23,300	$ 20,500
Provision for credit losses - unfunded commitments		$ (3,800)	0
Standby letters of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term		2 years
Impact of adopting ASC 326
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrual for off-balance sheet commitments					$ 20,500
Allowance on Collateral Dependent Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in collateral dependent loans		$ 17,600
Level One
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses - unfunded commitments		0	2,800
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,670,948	3,670,948	3,437,126
Year 2	498,757	498,757	576,080
Year 3	272,427	272,427	159,416
Commercial and industrial loans | Allowance on Collateral Dependent Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in collateral dependent loans		10,100
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,400,839	2,400,839	2,407,475
Year 2	535,962	535,962	615,408
Year 3	542,551	542,551	596,899
Commercial real estate, non-owner occupied | Allowance on Collateral Dependent Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in collateral dependent loans		9,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,288,921	2,288,921	2,096,655
Year 2	704,355	704,355	494,049
Year 3	448,226	448,226	405,136
Commercial And Industrial Loan One
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans charged off	$ 13,700
Commercial And Industrial Loan Two
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans charged off | loan	2
Loans charged off	$ 5,400
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,162,083	1,162,083	1,246,528
Year 2	208,567	208,567	324,004
Year 3	269,848	269,848	335,062
Commercial real estate, owner occupied | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in collateral dependent loans		2,500
Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	79,200	79,200	51,000
Increase in past due loans		28,200
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	34,075	34,075	29,051
Increase in past due loans		5,000
30-59 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,021	5,021	4,904
30-59 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	12,995	12,995	5,946
30-59 Days Past Due | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,810	11,810	8,607
30-59 Days Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0	4,495
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,189	11,189	5,935
Increase in past due loans		5,300
60-89 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,622	1,622	434
60-89 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	195	195	881
60-89 Days Past Due | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,472	5,472	2,278
60-89 Days Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	104	104	0
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	33,980	33,980	16,021
Increase in past due loans		18,000
90 Days or More Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,858	6,858	2,474
90 Days or More Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,465	11,465	5,153
90 Days or More Past Due | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	12,143	12,143	5,811
90 Days or More Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 110	$ 110	$ 319